Blanchard, Kenneth H., author
Fontana/Collins , 1987
Buku Teks
Webber, Ross A., author
Richard D. Irwin, 1981
Buku Teks
R.G.H. Siu
McGraw-Hill, 1980
Buku Teks
Thompson, Arthur A., 1940-, author
Business Publications , 1980
Buku Teks
Brown, Ronald
Amcom, 1979
Buku Teks